Low searchScore on 100% match

I have defined a autocomplete index like

    {
      "mappings": {
        "dynamic": false,
        "fields": {
          "presentationSeries": {
            "fields": {
              "title": {
                "analyzer": "lucene.danish",
                "type": "autocomplete"
              }
            },
            "type": "document"
          }
        }
      }
    }

And run a aggregation search like

    [{$search: {
      index: 'season-title',
      autocomplete: {
        query: 'deadline*',
        path: 'presentationSeries.title'
      }
    }}, {$project: {
      _id: 0,
      presentationSeriesId: "$_id",
      title: "$presentationSeries.title",
       score: {
        "$meta": "searchScore"
      }
    }}]

when running this agains documents where presentationSeries.title is “deadline” a 100% equality is present so i would expect the searchScore to be higher than a partial match. Eg
full match →

    {
                "title": "Deadline",
                "seasonId": "751967870000",
                "seriesId": "756177704000",
                "score": 4.8309083
            }

partial match->

    {
                "title": "Deadline 17:00",
                "seasonId": "751946357000",
                "seriesId": "756177704000",
                "score": 5.6943293
    }

When sorting on score the full match is shown last which is counter intuitive. Is there a reason why full match is scored lower than partial. And is there a way to boost full match ?